linux-kernel - [PATCH 3.2 061/185] devpts: plug the memory leak in kill

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Date:	Sun, 29 Dec 2013 03:08:43 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Ilija Hadzic" <ihadzic@...earch.bell-labs.com>,
	"Sukadev Bhattiprolu" <sukadev@...ux.vnet.ibm.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: [PATCH 3.2 061/185] devpts: plug the memory leak in kill_sb

3.2.54-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ilija Hadzic <ihadzic@...earch.bell-labs.com>

commit 66da0e1f9034140ae2f571ef96e254a25083906c upstream.

When devpts is unmounted, there may be a no-longer-used IDR tree hanging
off the superblock we are about to kill.  This needs to be cleaned up
before destroying the SB.

The leak is usually not a big deal because unmounting devpts is typically
done when shutting down the whole machine.  However, shutting down an LXC
container instead of a physical machine exposes the problem (the garbage
is detectable with kmemleak).

Signed-off-by: Ilija Hadzic <ihadzic@...earch.bell-labs.com>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/devpts/inode.c | 1 +
 1 file changed, 1 insertion(+)

--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -413,6 +413,7 @@ static void devpts_kill_sb(struct super_
 {
 	struct pts_fs_info *fsi = DEVPTS_SB(sb);
 
+	ida_destroy(&fsi->allocated_ptys);
 	kfree(fsi);
 	kill_litter_super(sb);
 }

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